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Step 2. Determine Total Room Volume

You will need to adjust the cubic footage to determine the Total Room Volume.

**Materials:**
- For natural stone or marble, multiply by 2.0.
- For ceramic or porcelain tile, or glass block, multiply by 1.35.
- If using another material, consult the manufacturer for their recommendation in a steam shower application.

**Exterior Wall:** For one, multiply by 1.1; for two, multiply by 1.2.

**Ceiling height:** For a 9 ft. ceiling, multiply by 1.15; for a 10 ft. ceiling, multiply by 1.3.